package com.coolweather.app.activity;

import android.app.Activity;
import android.app.ProgressDialog;
import android.os.Bundle;
import android.text.TextUtils;
import android.view.View;
import android.view.Window;
import android.widget.AdapterView;
import android.widget.ArrayAdapter;
import android.widget.ListView;
import android.widget.TextView;
import android.widget.Toast;

import com.coolweather.app.model.City;
import com.coolweather.app.model.CoolWeatherDB;
import com.coolweather.app.model.County;
import com.coolweather.app.model.Province;
import com.coolweather.app.util.HttpCallbackListener;
import com.coolweather.app.util.HttpUtil;
import com.coolweather.app.util.Utility;
import com.example.frost.coolweather.R;

import java.util.ArrayList;
import java.util.List;

/**
 * Created by Frost on 2016/4/3.
 */
public class ChooseAreaActivity extends Activity {
    public static final int LEVEL_PROVINCE = 0;
    public static final int LEVEL_CITY = 1;
    public static final int LEVEL_COUNTY = 2;
    private ProgressDialog progressDialog;
    private TextView titleText;
    private ListView listView;
    private ArrayAdapter<String> adapter;
    private CoolWeatherDB coolWeatherDB;
    private List<String> dataList = new ArrayList<String>();
    /**
     * 省列表
     */
    private List<Province> provinceList;
    /**
     * 市列表
     */
    private List<City> cityList;
    /**
     * 县列表
     */
    private List<County> countyList;
    /**
     * 选中的省份
     */
    private Province selectedProvince;
    /**
     * 选中的城市
     */
    private City selectedCity;
    /**
     * 当前选中的级别
     */
    private int currentLevel;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        requestWindowFeature(Window.FEATURE_NO_TITLE);
        setContentView(R.layout.choose_area);
        listView = (ListView) findViewById(R.id.list_view);
        titleText = (TextView) findViewById(R.id.title_text);
        adapter = new ArrayAdapter<String>(this, android.R.layout.simple_list_item_1, dataList);
        listView.setAdapter(adapter);
        coolWeatherDB = CoolWeatherDB.getInstance(this);
        listView.setOnItemClickListener(new AdapterView.OnItemClickListener() {
            @Override
            public void onItemClick(AdapterView<?> arg0, View view, int index,
                                    long arg3) {
                if (currentLevel == LEVEL_PROVINCE) {
                    selectedProvince = provinceList.get(index);
                    queryCities();
                } else if (currentLevel == LEVEL_CITY) {
                    selectedCity = cityList.get(index);
                    queryCounties();
                }
            }
        });
        queryProvinces();
// 加载省级数据
    }
    /**
     * 查询全国所有的省，优先从数据库查询，如果没有查询到再去服务器上查询。
     */
    private void queryProvinces() {
        provinceList = coolWeatherDB.loadProvinces();
        if (provinceList.size() > 0) {
            dataList.clear();
            for (Province province : provinceList) {
                dataList.add(province.getProvinceName());
            }
            adapter.notifyDataSetChanged();
            listView.setSelection(0);
            titleText.setText("中国");
            currentLevel = LEVEL_PROVINCE;
        } else {
            queryFromServer(null, "province");
        }
    }
    /**
     * 查询选中省内所有的市，优先从数据库查询，如果没有查询到再去服务器上查询。
     */
    private void queryCities() {
        cityList = coolWeatherDB.loadCities(selectedProvince.getId());
        if (cityList.size() > 0) {
            dataList.clear();
            for (City city : cityList) {
                dataList.add(city.getCityName());
            }
            adapter.notifyDataSetChanged();
            listView.setSelection(0);
            titleText.setText(selectedProvince.getProvinceName());
            currentLevel = LEVEL_CITY;
        } else {
            queryFromServer(selectedProvince.getProvinceCode(), "city");
        }
    }
    /**
     * 查询选中市内所有的县，优先从数据库查询，如果没有查询到再去服务器上查询。
     */
    private void queryCounties() {
        countyList = coolWeatherDB.loadCounties(selectedCity.getId());
        if (countyList.size() > 0) {
            dataList.clear();
            for (County county : countyList) {
                dataList.add(county.getCountyName());
            }
            adapter.notifyDataSetChanged();
            listView.setSelection(0);
            titleText.setText(selectedCity.getCityName());
            currentLevel = LEVEL_COUNTY;
        } else {
            queryFromServer(selectedCity.getCityCode(), "county");
        }
    }
/**
 * 根据传入的代号和类型从服务器上查询省市县数据。
 * */
private void queryFromServer(final String code, final String type) {
    String address;
    if (!TextUtils.isEmpty(code)) {
        address = "http://www.weather.com.cn/data/list3/city" + code +
                ".xml";
    } else {
        address = "http://www.weather.com.cn/data/list3/city.xml";
    }
    showProgressDialog();
    HttpUtil.sendHttpRequest(address, new HttpCallbackListener() {
        @Override
        public void onFinish(String response) {
            boolean result = false;
            if ("province".equals(type)) {
                result = Utility.handleProvincesResponse(coolWeatherDB,
                        response);
            } else if ("city".equals(type)) {
                result = Utility.handleCitiesResponse(coolWeatherDB,
                        response, selectedProvince.getId());
            } else if ("county".equals(type)) {
                result = Utility.handleCountiesResponse(coolWeatherDB,
                        response, selectedCity.getId());
            }
            if (result) {
// 通过runOnUiThread()方法回到主线程处理逻辑
                runOnUiThread(new Runnable() {
                    @Override
                    public void run() {
                        closeProgressDialog();
                        if ("province".equals(type)) {
                            queryProvinces();
                        } else if ("city".equals(type)) {
                            queryCities();
                        } else if ("county".equals(type)) {
                            queryCounties();
                        }
                    }
                });
            }
        }

        @Override
        public void onError(Exception e) {
// 通过runOnUiThread()方法回到主线程处理逻辑
            runOnUiThread(new Runnable() {
                @Override
                public void run() {
                    closeProgressDialog();
                    Toast.makeText(ChooseAreaActivity.this,
                            "加载失败", Toast.LENGTH_SHORT).show();
                }
            });
        }
    });
}
    /**
     * 显示进度对话框
     */
    private void showProgressDialog() {
        if (progressDialog == null) {
            progressDialog = new ProgressDialog(this);
            progressDialog.setMessage("正在加载...");
            progressDialog.setCanceledOnTouchOutside(false);
        }
        progressDialog.show();
    }
    /**
     * 关闭进度对话框
     */
    private void closeProgressDialog() {
        if (progressDialog != null) {
            progressDialog.dismiss();
        }
    }
/**
 * 捕获Back按键，根据当前的级别来判断，此时应该返回市列表、省列表、还是直接退出。
 * */
@Override
public void onBackPressed() {
    if (currentLevel == LEVEL_COUNTY) {
        queryCities();
    } else if (currentLevel == LEVEL_CITY) {
        queryProvinces();
    } else {
        finish();
    }
}
}
